In linux it is really easy to do MAC address spoofing. All you need is
the trust command line tool ifconfig.
Enter the command as follows:
ifconfig eth0 hw ether 00:00:AA:AA:AA:AA
Change eth0 to your card name and "00:00:AA:AA:AA:AA" to the address
you want to spoof.
Before issuing the command you need to take down the card by issuing
"ifconfig eth0 down". Then afterwards issue "ifconfig eth0 up". And you
will be in business.